<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Insert title here</title>
</head>
<body>
         <form action="login" method="POST">
          <input type="text" name="username" value="yh"/>
              <input type="text" name="password" value="1232"/>
              <input type="submit" name="xx" value="提交"/>
         </form>
</body>
</html>